:root{color-scheme:dark;--bg:#0a1014;--ink:#f4f0e7;--muted:#b7c3c2;--gold:#dcbc7a;--line:#3d4d4c}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--gold);text-underline-offset:4px}button,select{font:inherit;color:inherit;background:#152025;border:1px solid var(--line);border-radius:5px;padding:9px 14px;cursor:pointer}button:hover,a:hover{color:#ffe2a5}button:focus-visible,a:focus-visible,select:focus-visible{outline:2px solid var(--gold);outline-offset:4px}button:disabled{opacity:.35;cursor:default}.topbar{max-width:1400px;margin:auto;padding:18px 28px;display:flex;justify-content:space-between;gap:18px;align-items:center;border-bottom:1px solid var(--line)}.topbar nav{display:flex;gap:22px;flex-wrap:wrap}.brand{font-size:15px;white-space:nowrap}.intro{max-width:1320px;margin:auto;padding:24px 20px 16px;display:flex;align-items:end;justify-content:space-between;gap:20px}.intro h1{margin:0;font-size:25px;font-weight:600}.intro p{margin:8px 0 0;color:var(--muted);font-size:14px}.intro a{font-size:14px}.deck-wrap{max-width:1320px;margin:auto;padding:0 20px}.slide[hidden]{display:none!important}.canvas{position:relative;aspect-ratio:16/9;background:var(--bg);overflow:hidden}.slide-image{display:block;width:100%;height:100%;object-fit:contain}.media{position:absolute;margin:0;left:var(--x);top:var(--y);width:var(--w);height:var(--h)}.media video{display:block;width:100%;height:100%;object-fit:contain;background:#0a1014}.media figcaption{display:none}.video-help{font-size:13px;color:var(--muted);margin:10px 0;text-align:right}.transcript{border-top:1px solid var(--line);padding:14px 0;margin-top:14px;max-width:960px}.transcript summary{cursor:pointer;color:var(--gold);font-size:15px}.transcript h2{font-size:25px;margin:22px 0 16px}.transcript p{font-size:18px;line-height:1.85;margin:8px 0;color:var(--muted)}.transcript p.emphasis{color:var(--ink);font-weight:600}.controls{position:sticky;bottom:0;z-index:10;background:rgba(10,16,20,.96);border-top:1px solid var(--line);padding:12px 20px;display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}.controls select{max-width:460px;min-width:160px;flex:1}.controls-inner{width:100%;max-width:1280px;display:flex;gap:12px;align-items:center}.extras{display:flex;gap:12px;align-items:center;margin-left:auto}footer{max-width:1280px;margin:22px auto 28px;padding:0 20px;color:var(--muted);font-size:13px;line-height:2}footer p{margin:6px 0}footer nav{display:flex;gap:22px;flex-wrap:wrap}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.reading .canvas{aspect-ratio:auto;overflow:visible}.reading .slide-image{height:auto}.reading .media{position:static;width:min(100%,380px);height:auto;display:inline-block;margin:22px 18px 12px 0;vertical-align:top}.reading .media video{width:100%;height:auto;max-height:65vh}.reading .media figcaption{display:block;font-size:17px;color:var(--gold);padding-top:10px}.reading .video-help{text-align:left}.reading .transcript{max-width:none}.reading .transcript summary{display:none}.reading .transcript[open]{padding:20px 0}.reading .transcript .body-copy{max-width:960px}body:fullscreen .topbar,body:fullscreen .intro,body:fullscreen footer{display:none}body:fullscreen .deck-wrap{max-width:min(100vw,calc((100vh - 72px)*16/9));padding:0}body:fullscreen .video-help,body:fullscreen .transcript{display:none}body:fullscreen .controls{position:fixed;width:100%;bottom:0}body:fullscreen .canvas{height:auto} @media(max-width:720px){.topbar{padding:14px 18px;align-items:start;flex-direction:column;gap:10px}.topbar nav{gap:18px;font-size:14px}.intro{padding:22px 18px 16px;align-items:start;flex-direction:column;gap:12px}.intro h1{font-size:24px;line-height:1.45}.intro p{line-height:1.7}.deck-wrap{padding:0 14px}.controls{padding:10px 12px}.controls-inner{gap:8px;flex-wrap:wrap}.controls select{max-width:none;width:calc(100% - 158px);padding:10px 4px;font-size:13px;min-width:80px}.controls button{padding:10px;font-size:13px}.extras{margin:2px 0 0;width:100%;justify-content:center}.reading .media{display:block;margin:18px auto 26px;width:min(100%,380px)}.transcript h2{font-size:23px}.transcript p{font-size:17px}.transcript{margin-top:0}.video-help{font-size:12px}footer{padding:0 18px;margin-top:20px}}

@media(max-width:720px){.reading .slide{display:flex;flex-direction:column}.reading .transcript{order:-1;padding-top:6px}.reading .canvas{margin-top:12px}.reading .transcript p{margin:7px 0}.reading .transcript h2{margin-top:12px}}

.slide-image{clip-path:inset(0 1px 0 0)}